I have a 1994 Pontiac Grand Prix SE, 3100 v6. She developed a miss. Thinking she needed a tune up, I replaced the plugs, and the wires. No change, aftertesting the ignition system, and finding nothing.. I sent her off to a mechanic. The mechanic replaced one coil pack, and said the previous was bad and the spark plugs, but the miss was still there. They did a compression check, and all seemed ok. They wanted to replace all the injectors, after $250.00 and what seemed like the throwing of parts, I took the car to a family mechanic. He's a good guy that knows his stuff, but he's stumped. I have one cylinder that the spark plug is fuel fowled. Going from the previous mechanics suggestion, we replaced the fuel injector. Nothing changed. We have good spark to all cylinders. My family mechanic thinks that maybe the cam lobe could be bad, allowing compression to check out, but not allowing fire to ignite the fuel. We are going to remove the valve cover and see how the valve movement goes, but again if that isn't the trouble, he is stumped. Does anyone have any other ideas about what could be causing the problem?